Vanity Fair has an interesting article about White House Press Secretary Scott McClellan entitled Words Fail Him. It's a long article that tries to delve into the motivations behind wanting such a thankless job and why W's administration might have chosen him:

Now that the daily White House briefings are instantly available online, Press Secretary Scott McClellan's mangled sentences, flat-footed evasions, and genial befuddlement have made him the butt of a thousand blogs, as well as of an increasingly savage press corps. Is he a victim, a pawn, or a P.R. disaster?
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Putting someone as strikingly out of his depth as McClellan into this job (and keeping him there) could well be part of this administration's contempt for the press. But while that contempt is surely real, installing McClellan here may actually, in another self-awareness gap, have been the administration's idea of a generous act.

Definitely worth the read. By the way, rumor is that the current administration shake-up may include McClellan. We'll soon see, I think...